Abstract: A circuit for driving a saw-tooth current in a coil includes a deflection circuit formed by the coil connected in parallel with a retrace capacitor and in series with a trace capacitor. The deflection circuit is connected in parallel with a first diode which conducts during the first half of the trace interval and in parallel with a second diode connected in series with a controllable switch which conducts during the second half of the trace interval. While the transistor is conductive, current flows through an inductor connected in series with it. The energy stored in this inductor is transferred at a subsequent stage partly to the deflection circuit and partly to a further capacitor. The further capacitor subsequently itself transfers the charge stored in it through a second inductor and a fourth diode to the deflection circuit so that at no time is energy dissipated in a load.

Abstract: A circuit arrangement for driving saw-tooth current through a coil comprising a trace capacitor and a retrace capacitor, connected in a closed loop with said coil, a current recovery diode connected in parallel with the said retrace condenser, a first controllable switch, having a control electrode operative to receive periodic control signals to render the said first switch conductive during part of the trace interval, and an inductance connecting the said first switch to a power supply source in which energy is stored during the interval in which the said first switch is conductive and from which energy is supplied to the said first retrace capacitor by way of a second diode and a third capacitor when the said first switch is not conductive, the energy stored in the said third capacitor when the said first switch is not conductive, being restored to the supply source when the said first switch is conductive by way of a second controllable switch.

Abstract: A circuit for providing saw-tooth current, with a trace and a retrace interval, in a coil, in particular a deflection coil of a television kinescope, in which the coil is connected to a retrace condenser and a trace condenser so as to form a deflection circuit which oscillates freely during the retrace interval, is described. In this circuit, a first diode is connected parallel to the deflection circuit with such polarity as to be made conductive by the saw-tooth current during the first part of the trace interval, and the said deflection circuit is also connected parallel, by means of a second diode having such polarity as to be made conductive by the saw-tooth current during a second part of the trace interval, to a controllable switch, which is made conductive during part of the trace interval.

Abstract: A circuit arrangement for providing a saw-tooth current, with trace and retrace (flyback) intervals, in a deflection coil, in which the amplitude of said current is affected by modulation signal, the arrangement comprising in addition to the said deflection coil, a first retrace capacitor and a first trace capacitor which, together with the deflection coil, form a first oscillating circuit during the retrace interval, a second inductance coil, a second retrace capacitor and a second trace capacitor which form a second oscillating circuit during the retrace interval, a controllable switch connected to a power supply source through a third inductance coil and having a control electrode, connected to a periodic signal source for making the controllable switch conductive during a second part of the trace interval, and a first diode and a second diode, connected in parallel with the first and second retrace capacitors, respectively, the polarity of the diodes being such that they are made conductive by current flo

Abstract: The invention is concerned with a circuit arrangement for driving a saw-tooth current in a coil primarily intended for use as a line output stage for a television receiver. The circuit arrangement comprises a parallel resonant circuit which incorporates a line deflection coil, a diode connected in parallel with the coil to conduct the deflection current during a first portion of each operating cycle, a second diode and a thyristor connected in series with one another in parallel with the coil, the thyristor being fired by pilot pulses to conduct the deflection current in a second portion of each cycle immediately following the first portion, a series resonant circuit including a capacitor connected in parallel with a thyristor for quenching the thyristor at the end of the second portion of each cycle and a third diode connected in series with the capacitor in a circuit branch connected in parallel with the second diode and serving to transfer energy from the series resonant to the parallel resonant circuit.

Abstract: A circuit for providing saw-tooth current with a trace and retrace interval in a coil, in particular a deflection coil of a television kinescope, in which the coil is connected to a trace and retrace condenser with which it forms a resonant circuit, is described. In this circuit, a first diode is connected in parallel to the resonant circuit with such polarity that it is made conductive by the saw-tooth current during the first part of the trace interval, and the resonant circuit is also connected, through a second diode, to a controllable switch, which is made conductive at least during that last part of the trace interval, the second diode being connected with such polarity that it is made conductive by the saw-tooth current during the last part of the trace interval.

Abstract: A line output stage comprising a first parallel resonant circuit including a horizontal deflection coil and a capacitor, one side of the first resonant circuit being connected to ground and the other side of the first resonant circuit being returned to ground by way of a first diode and a controllable semi-conductor switch, a second diode connected in parallel with the first resonant circuit, a second parallel resonant circuit comprising a second coil having one side connected to a DC power supply terminal and the other side returned to ground by way of the controllable semi-conductor switch, means for applying periodic pilot pulses to the controllable semi-conductor switch and an energy transfer circuit inductively or capacitatively coupled to the said second parallel resonant circuit for transferring energy during each cycle from the second parallel resonant circuit to the first parallel resonant circuit, the said energy transfer circuit including a third diode and means for modulating the power transferred

Abstract: A circuit for providing a saw-tooth current in a coil is described. The circuit comprises a trace condenser and a retrace condenser which form together with the coil a resonant circuit during the retrace interval, a diode connected parallel to the retrace condenser, a controllable switch connected to a supply source through an inductor and to the retrace condenser through a second diode.The main feature of this circuit is to comprise a condenser connected on one hand towards the controllable switch and the first inductor and, on the other hand, to a circuit comprising a second inductor and, through a third diode, towards the retrace condenser. The condenser and the two inductors are sized in such a manner that when the controllable switch is not conductive, energy is supplied to the condenser and that successively, when the controllable switch is conductive, the condenser is completely discharged through the second inductor. The energy thus stored in the second inductor is then supplied to a storage device.

Abstract: A circuit for generating a saw-tooth current waveform in a coil comprises a parallel resonant circuit, of which the coil in which the saw-tooth current is to be generated forms part. The parallel resonant circuit includes two capacitors in parallel and a first diode, in parallel with one of the capacitors, and in parallel with which is a switching transistor connected via a second diode to the cathode of the first diode. Input energy from a power source is fed to the junction between the second diode and the switching transistor via an inductance which forms a resonant circuit with a further capacitor forming at least part of a reactance in parallel with the second diode.

Abstract: A circuit arrangement for obtaining a periodic sawtooth current in a coil, particularly in a deflection coil of a kinescope, is described. The circuit arrangement comprises a first, unidirectional conductivity device, disposed in parallel to a circuit branch comprising the deflection coil, and a second, controllable switching device, having a control electrode connected to a source of periodic pulses which render conductive the second device during a part of the period of the sawtooth. The main feature of the circuit arrangement is to comprise a resonant series circuit disposed in parallel to the second device; the second device and the resonant series circuit are connected to the deflection coil and to the first device at least through a third, unidirectional conductivity device.